What explains the result?
For a small swing, a longer pendulum has a longer period; bob mass has little effect in this ideal model.
PHYSICAL SCIENCE · GRADES 4–8
Pendulum timing mission
INVESTIGATION QUESTIONHow does string length change the time for a swing?
● ILLUSTRATIVE SCIENCE MODEL
ENGLISH CAPTIONS
Measure the pendulum length. A consistent length definition improves timing comparisons.
0.0 / 3.0 s
Where does this matter?
Pendulum timing appears in clocks and helps compare repeating motion.
What should you keep in mind?
Large release angles, a moving pivot, and stopwatch reaction time change a real result.
DEDICATED INVESTIGATION · GRADES 5–9
Pendulum timing room
Change one thing at a time. Measure ten swings, calculate one period, then compare how string length changes the rhythm.
INVESTIGATION QUESTIONHow does pendulum length affect the time for one complete swing?
RIG 01 · SMALL RELEASE ANGLESIMULATED TIMING
0 cm3060
60 g
STRING 40 cmMODEL PERIOD 1.27 s
RUN TIMER— —
FIELD NOTEBOOK
Compare your runs
Run a measurement to add the first row. Repeat each length so you can compare trials instead of trusting a single swing.
WHAT THE PATTERN MEANS
A longer pendulum usually takes more time per swing. The ideal model predicts period depends on length and gravity, while bob mass has little effect. Real timing also includes reaction time, pivot friction, and how consistently the bob is released.